A Nasa space telescope is about to launch on a mission to explore the Universe with "gamma-ray glasses".The Glast mission will shed light on some of the most violent events in the Universe, that release massive amounts of energy in the form of gamma-rays.
It will scan the sky for massive cosmic explosions, giant black holes that hurl matter across space, and dense neutron stars with powerful magnetic fields.
Glast is due to lift off from Florida on Wednesday atop a Delta II rocket.
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